Figure 7

A model for IFT88 mediated secretory pathway from ER to primary cilia. IFT88 is found at the ER exit sites, where it is incorporated into the ER-derived COP II-coated vesicles. The IFT88 containing COP II vesicles travel directly to cilia bypassing the Golgi apparatus. The newly identified IFT88-binding protein DGKδ is colocalized with IFT88 at the ER exit sites and is required for triggering the release of IFT88 vesicles from the ER.